The electrical power dissipated by a resistance R is
a. inversely proportional to I.
b. directly proportional to I2.
c. directly proportional to I.
d. none of these.
[Ques. 2] The bright and dark bands you see in a photograph of a double slit interference pattern represent
a. the respective positions of the crests and the troughs of the light wave.
b. an interference pattern that is not present unless it is produced by the camera lens.
c. the respective positions of constructive and destructive interference of light from the two sources.
d. the respective positions of destructive and constructive interference of light from the two sources.
e. the respective positions of bright and dark particles of light.
[Ques. 3] The Moon revolves eastward around Earth every ______________ solar days.
Fill in the blank(s) with correct word
[Ques. 4] For an ohmic conductor, current is
a. directly proportional to voltage.
b. directly proportional to resistance.
c. independent of resistance.
d. independent of voltage.
[Ques. 5] In a Newton's rings apparatus, find the phase difference (in radians) when an air wedge of 500 nm thickness is illuminated with red light ( = 640 nm).
a. 13
b. 11
c. 9
d. 7
e. 3
[Ques. 6] The oldest Moon rocks are about ______________ years old.
Fill in the blank(s) with correct word
[Ques. 7] For an ohmic conductor, current is
a. inversely proportional to voltage.
b. inversely proportional to resistance.
c. independent of resistance.
d. independent of voltage.
[Ques. 8] A thin sheet of plastic (n = 1.60) is inserted between two panes of glass to reduce infrared ( = 700 nm) losses. What thickness (in nm) is necessary to produce constructive interference in the reflected infrared radiation?
a. 218
b. 109
c. 55
d. 318
e. 443
[Ques. 9] The Moon's average distance from Earth is about ______________ km.
Fill in the blank(s) with correct word
[Ques. 10] Which of the following would be the least conductive?
a. Copper
b. Salt water
c. Glass
d. Mercury
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